/*********************************************************************************
*Function : uint16_t EEPROM_WriteVariable(uint16_t EepromAddress, uint16_t EepromData)
*Description : Writes/upadtes variable data in EEPROM.
*Input : EepromAddress: Variable virtual address
EepromData: 16 bit data to be written
*Output : none
*Return : Success or error status:
* - FLASH_COMPLETE: on success
* - PAGE_FULL: if valid page is full
* - NO_VALID_PAGE: if no valid page was found
* - Flash error code: on write Flash error
*author : lz
*date : 2015-2-1
*Others : none
**********************************************************************************/
uint16_t EEPROM_WriteVariable(uint16_t EepromAddress, uint16_t EepromData)
{
uint16_t Status = 0;
/* Unlock the Flash Program Erase controller */
FLASH_Unlock();
/* Write the variable virtual address and value in the EEPROM */
Status = EEPROM_VerifyPageFullWriteVariable(EepromAddress, EepromData);
/* In case the EEPROM active page is full */
if (Status == PAGE_FULL)
{
/* Perform Page transfer */
Status = EEPROM_PageTransfer(EepromAddress, EepromData);
}
/* Return last operation status */
return Status;
}
/*********************************************************************************
*Function : static uint16_t EEPROM_PageTransfer(uint16_t EepromAddress, uint16_t EepromData)
*Description : Transfers last updated variables data from the full Page to an empty one.
*Input : EepromAddress: 16 bit virtual address of the variable
EepromData: 16 bit data to be written as variable value
*Output : none
*Return : Success or error status:
* - FLASH_COMPLETE: on success
* - PAGE_FULL: if valid page is full
* - NO_VALID_PAGE: if no valid page was found
* - Flash error code: on write Flash error
*author : lz
*date : 2015-2-1
*Others : none
**********************************************************************************/
static uint16_t EEPROM_PageTransfer(uint16_t EepromAddress, uint16_t EepromData)
{
FLASH_Status FlashStatus = FLASH_COMPLETE;
uint32_t OldPageAddress = PAGE0_BASE_ADDRESS, NewPageAddress = PAGE1_BASE_ADDRESS;
uint16_t ValidPage = PAGE0, EepromAddressIdx = 0;
uint16_t EepromStatus = 0, ReadStatus = 0;
/* Get active Page for read operation */
ValidPage = EEPROM_FindValidPage(READ_FROM_VALID_PAGE);
if (ValidPage == PAGE1) /* Page1 valid */
{
/* New page address where variable will be moved to */
NewPageAddress = PAGE0_BASE_ADDRESS;
/* Old page address where variable will be taken from */
OldPageAddress = PAGE1_BASE_ADDRESS;
}
else if (ValidPage == PAGE0) /* Page0 valid */
{
/* New page address where variable will be moved to */
NewPageAddress = PAGE1_BASE_ADDRESS;
/* Old page address where variable will be taken from */
OldPageAddress = PAGE0_BASE_ADDRESS;
}
else
{
return NO_VALID_PAGE; /* No valid Page */
}
/* Set the new Page status to RECEIVE_DATA status */
FlashStatus = FLASH_ProgramHalfWord(NewPageAddress, RECEIVE_DATA);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Write the variable passed as parameter in the new active page */
EepromStatus = EEPROM_VerifyPageFullWriteVariable(EepromAddress, EepromData);
/* If program operation was failed, a Flash error code is returned */
if (EepromStatus != FLASH_COMPLETE)
{
return EepromStatus;
}
/* Transfer process: transfer variables from old to the new active page */
for (EepromAddressIdx = 0; EepromAddressIdx < EEPROM_SIZE; EepromAddressIdx++)
{
if (EepromAddressTab[EepromAddressIdx] != EepromAddress) /* Check each variable except the one passed as parameter */
{
/* Read the other last variable updates */
ReadStatus = EEPROM_ReadVariable(EepromAddressTab[EepromAddressIdx], &EepromDataVar);
/* In case variable corresponding to the virtual address was found */
if (ReadStatus != 0x1)
{
/* Transfer the variable to the new active page */
EepromStatus = EEPROM_VerifyPageFullWriteVariable(EepromAddressTab[EepromAddressIdx], EepromDataVar);
/* If program operation was failed, a Flash error code is returned */
if (EepromStatus != FLASH_COMPLETE)
{
return EepromStatus;
}
}
}
}
/* Erase the old Page: Set old Page status to ERASED status */
FlashStatus = FLASH_ErasePage(OldPageAddress);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Set new Page status to VALID_PAGE status */
FlashStatus = FLASH_ProgramHalfWord(NewPageAddress, VALID_PAGE);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Return last operation flash status */
return FlashStatus;
}
/*********************************************************************************
*Function : uint16_t EEPROM_Init(void)
*Description : Restore the pages to a known good state in case of page's status corruption after a power loss.
*Input : none
*Output : none
*Return : none
*author : lz
*date : 2015-2-1
*Others : none
**********************************************************************************/
uint16_t EEPROM_Init(void)
{
uint16_t PageStatus0 = 6, PageStatus1 = 6;
uint16_t EepromAddressIdx = 0;
uint16_t EepromStatus = 0, ReadStatus = 0;
int16_t x = -1;
uint16_t FlashStatus;
/* Unlock the Flash Program Erase controller */
FLASH_Unlock();
/* Get Page0 status */
PageStatus0 = (*(__IO uint16_t*)PAGE0_BASE_ADDRESS);
/* Get Page1 status */
PageStatus1 = (*(__IO uint16_t*)PAGE1_BASE_ADDRESS);
/* Check for invalid header states and repair if necessary */
switch (PageStatus0)
{
case ERASED:
if (PageStatus1 == VALID_PAGE) /* Page0 erased, Page1 valid */
{
/* Erase Page0 */
FlashStatus = FLASH_ErasePage(PAGE0_BASE_ADDRESS);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else if (PageStatus1 == RECEIVE_DATA) /* Page0 erased, Page1 receive */
{
/* Erase Page0 */
FlashStatus = FLASH_ErasePage(PAGE0_BASE_ADDRESS);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Mark Page1 as valid */
FlashStatus = FLASH_ProgramHalfWord(PAGE1_BASE_ADDRESS, VALID_PAGE);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else /* First EEPROM access (Page0&1 are erased) or invalid state -> format EEPROM */
{
/* Erase both Page0 and Page1 and set Page0 as valid page */
FlashStatus = EEPROM_Format();
/* If erase/program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
break;
case RECEIVE_DATA:
if (PageStatus1 == VALID_PAGE) /* Page0 receive, Page1 valid */
{
/* Transfer data from Page1 to Page0 */
for (EepromAddressIdx = 0; EepromAddressIdx < EEPROM_SIZE; EepromAddressIdx++)
{
if (( *(__IO uint16_t*)(PAGE0_BASE_ADDRESS + 6)) == EepromAddressTab[EepromAddressIdx])
{
x = EepromAddressIdx;
}
if (EepromAddressIdx != x)
{
/* Read the last variables' updates */
ReadStatus = EEPROM_ReadVariable(EepromAddressTab[EepromAddressIdx], &EepromDataVar);
/* In case variable corresponding to the virtual address was found */
if (ReadStatus != 0x1)
{
/* Transfer the variable to the Page0 */
EepromStatus = EEPROM_VerifyPageFullWriteVariable(EepromAddressTab[EepromAddressIdx], EepromDataVar);
/* If program operation was failed, a Flash error code is returned */
if (EepromStatus != FLASH_COMPLETE)
{
return EepromStatus;
}
}
}
}
/* Mark Page0 as valid */
FlashStatus = FLASH_ProgramHalfWord(PAGE0_BASE_ADDRESS, VALID_PAGE);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Erase Page1 */
FlashStatus = FLASH_ErasePage(PAGE1_BASE_ADDRESS);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else if (PageStatus1 == ERASED) /* Page0 receive, Page1 erased */
{
/* Erase Page1 */
FlashStatus = FLASH_ErasePage(PAGE1_BASE_ADDRESS);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Mark Page0 as valid */
FlashStatus = FLASH_ProgramHalfWord(PAGE0_BASE_ADDRESS, VALID_PAGE);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else /* Invalid state -> format eeprom */
{
/* Erase both Page0 and Page1 and set Page0 as valid page */
FlashStatus = EEPROM_Format();
/* If erase/program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
break;
case VALID_PAGE:
if (PageStatus1 == VALID_PAGE) /* Invalid state -> format eeprom */
{
/* Erase both Page0 and Page1 and set Page0 as valid page */
FlashStatus = EEPROM_Format();
/* If erase/program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else if (PageStatus1 == ERASED) /* Page0 valid, Page1 erased */
{
/* Erase Page1 */
FlashStatus = FLASH_ErasePage(PAGE1_BASE_ADDRESS);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else /* Page0 valid, Page1 receive */
{
/* Transfer data from Page0 to Page1 */
for (EepromAddressIdx = 0; EepromAddressIdx < EEPROM_SIZE; EepromAddressIdx++)
{
if ((*(__IO uint16_t*)(PAGE1_BASE_ADDRESS + 6)) == EepromAddressTab[EepromAddressIdx])
{
x = EepromAddressIdx;
}
if (EepromAddressIdx != x)
{
/* Read the last variables' updates */
ReadStatus = EEPROM_ReadVariable(EepromAddressTab[EepromAddressIdx], &EepromDataVar);
/* In case variable corresponding to the virtual address was found */
if (ReadStatus != 0x1)
{
/* Transfer the variable to the Page1 */
EepromStatus = EEPROM_VerifyPageFullWriteVariable(EepromAddressTab[EepromAddressIdx], EepromDataVar);
/* If program operation was failed, a Flash error code is returned */
if (EepromStatus != FLASH_COMPLETE)
{
return EepromStatus;
}
}
}
}
/* Mark Page1 as valid */
FlashStatus = FLASH_ProgramHalfWord(PAGE1_BASE_ADDRESS, VALID_PAGE);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Erase Page0 */
FlashStatus = FLASH_ErasePage(PAGE0_BASE_ADDRESS);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
break;
default: /* Any other state -> format eeprom */
/* Erase both Page0 and Page1 and set Page0 as valid page */
FlashStatus = EEPROM_Format();
/* If erase/program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
break;
}
return FLASH_COMPLETE;
}
/**
* @brief Restore the pages to a known good state in case of page's status
* corruption after a power loss.
* @param None.
* @retval - Flash error code: on write Flash error
* - FLASH_COMPLETE: on success
*/
static uint16_t EEPROM_Init(void)
{
uint16_t PageStatus0 = 6, PageStatus1 = 6;
uint16_t virtualAddress = 0;
uint16_t EepromStatus = 0, ReadStatus = 0;
int16_t x = -1;
uint16_t FlashStatus;
uint16_t EepromDataVar = 0;
/* Calling this is here is critical on STM32F2 Devices Else Flash Operation Fails */
FLASH_ClearFlags();
/* Get Page0 status */
PageStatus0 = (*(__IO uint16_t*)PAGE0_BASE_ADDRESS);
/* Get Page1 status */
PageStatus1 = (*(__IO uint16_t*)PAGE1_BASE_ADDRESS);
/* Check for invalid header states and repair if necessary */
switch (PageStatus0)
{
case ERASED:
if (PageStatus1 == VALID_PAGE) /* Page0 erased, Page1 valid */
{
/* Normal valid state -> nothing to do */
}
else if (PageStatus1 == RECEIVE_DATA) /* Page0 erased, Page1 receive */
{
/* Erase Page0 */
FlashStatus = FLASH_EraseSector(PAGE0_ID, VOLTAGE_RANGE);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Mark Page1 as valid */
FlashStatus = FLASH_ProgramHalfWord(PAGE1_BASE_ADDRESS, VALID_PAGE);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else /* First EEPROM access (Page0&1 are erased) or invalid state -> format EEPROM */
{
/* Erase both Page0 and Page1 and set Page0 as valid page */
FlashStatus = EEPROM_Format();
/* If erase/program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
break;
case RECEIVE_DATA:
if (PageStatus1 == VALID_PAGE) /* Page0 receive, Page1 valid */
{
/* Transfer data from Page1 to Page0 */
for (virtualAddress = 0; virtualAddress < EEPROM_SIZE; virtualAddress++)
{
if (( *(__IO uint16_t*)(PAGE0_BASE_ADDRESS + 6)) == virtualAddress)
{
x = virtualAddress;
}
if (virtualAddress != x)
{
/* Read the last variables' updates */
ReadStatus = EEPROM_ReadVariable(virtualAddress, &EepromDataVar);
/* In case variable corresponding to the virtual address was found */
if (ReadStatus != 0x1)
{
/* Transfer the variable to the Page0 */
EepromStatus = EEPROM_VerifyPageFullWriteVariable(virtualAddress, EepromDataVar);
/* If program operation was failed, a Flash error code is returned */
if (EepromStatus != FLASH_COMPLETE)
{
return EepromStatus;
}
}
}
}
/* Mark Page0 as valid */
FlashStatus = FLASH_ProgramHalfWord(PAGE0_BASE_ADDRESS, VALID_PAGE);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Erase Page1 */
FlashStatus = FLASH_EraseSector(PAGE1_ID, VOLTAGE_RANGE);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else if (PageStatus1 == ERASED) /* Page0 receive, Page1 erased */
{
/* Erase Page1 */
FlashStatus = FLASH_EraseSector(PAGE1_ID, VOLTAGE_RANGE);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Mark Page0 as valid */
FlashStatus = FLASH_ProgramHalfWord(PAGE0_BASE_ADDRESS, VALID_PAGE);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else /* Invalid state -> format eeprom */
{
/* Erase both Page0 and Page1 and set Page0 as valid page */
FlashStatus = EEPROM_Format();
/* If erase/program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
break;
case VALID_PAGE:
if (PageStatus1 == VALID_PAGE) /* Harmless invalid state -> pick one page and format the other */
{
/* Erase Page0 */
FlashStatus = FLASH_EraseSector(PAGE0_ID, VOLTAGE_RANGE);
/* If erase/program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
else if (PageStatus1 == ERASED) /* Page0 valid, Page1 erased */
{
/* Normal valid state -> nothing to do */
}
else /* Page0 valid, Page1 receive */
{
/* Transfer data from Page0 to Page1 */
for (virtualAddress = 0; virtualAddress < EEPROM_SIZE; virtualAddress++)
{
if ((*(__IO uint16_t*)(PAGE1_BASE_ADDRESS + 6)) == virtualAddress)
{
x = virtualAddress;
}
if (virtualAddress != x)
{
/* Read the last variables' updates */
ReadStatus = EEPROM_ReadVariable(virtualAddress, &EepromDataVar);
/* In case variable corresponding to the virtual address was found */
if (ReadStatus != 0x1)
{
/* Transfer the variable to the Page1 */
EepromStatus = EEPROM_VerifyPageFullWriteVariable(virtualAddress, EepromDataVar);
/* If program operation was failed, a Flash error code is returned */
if (EepromStatus != FLASH_COMPLETE)
{
return EepromStatus;
}
}
}
}
/* Mark Page1 as valid */
FlashStatus = FLASH_ProgramHalfWord(PAGE1_BASE_ADDRESS, VALID_PAGE);
/* If program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
/* Erase Page0 */
FlashStatus = FLASH_EraseSector(PAGE0_ID, VOLTAGE_RANGE);
/* If erase operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
}
break;
default: /* Any other state -> format eeprom */
/* Erase both Page0 and Page1 and set Page0 as valid page */
FlashStatus = EEPROM_Format();
/* If erase/program operation was failed, a Flash error code is returned */
if (FlashStatus != FLASH_COMPLETE)
{
return FlashStatus;
}
break;
}
return FLASH_COMPLETE;
}